I'm about to get the Frances for the first time and I'm curious as well to see the difference. I'm hoping that speed and armor will get more to target than with Bettys and Nells. In naval attacks these two have been useful for a while now, while they are still useful for LR search and night missions. I'll keep all three lines going for some of the reasons stated and one other. I also want to see if the ohka is useful with the Bettys later in the war.

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"Success is the ability to go from one failure to another with no loss of enthusiasm." - Winston Churchill

I like the Nell, produce it the whole war. Betty, some, but not so much once the G3M3 Nell is available. Cheap patrol and effective night bombing. That's how they were used for most of the war after early '42, so ....

Day bombing is limited to your escort range after about 4/42, and by late war that is pretty short (Sam/Frank neither have a lot of range). Some like to use Oscar/Zero as "ablative" armor. I think that works, but only a few times. Once you have "trained" up so many allied pilots it rapidly starts to fail as a viable tactic. Kami's are pretty short range as well.